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From: iamjoonsoo.kim@lge.com (Joonsoo Kim)
To: linux-arm-kernel@lists.infradead.org
Subject: Why does unmap_area_sections() depend on !CONFIG_SMP?
Date: Tue, 1 Oct 2013 18:59:55 +0900	[thread overview]
Message-ID: <20131001095955.GA22859@lge.com> (raw)

Hello, Russell.

I looked at ioremap code in arm tree and found that unmap_area_sections()
is enabled only if !CONFIG_SMP. I can't understand the comments
above this function and it comes from you. Could you elaborate more
on this?

I guess that flush_cache_vunmap() before clearing page table and
flush_tlb_kernel_range() after clearing page table is safe enough to cache
consistency regardless CONFIG_SMP configuration. I think that 4K vunmap()
also depends on this flushing logic.

Please let me know what I am missing here.

Thanks.

             reply	other threads:[~2013-10-01  9:59 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-10-01  9:59 Joonsoo Kim [this message]
2013-10-01 18:23 ` Why does unmap_area_sections() depend on !CONFIG_SMP? Nicolas Pitre
2013-10-02  5:05   ` 김준수

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